In star clusters, the ____ stars are giant stars fusing helium in their cores and then in their shells.
A) turnoff-point
B) main-sequence
C) turnon-point
D) hydrogen-flash
E) horizontal-branch
Correct Answer:
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A)a planetary nebula.
B)a Bok
Q5: Star clusters are important to our study
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A) because helium is very
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Q11: A star will experience a helium flash
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